шёл курс по Audacity и решил напечатать весь код, но затем я столкнулся с ошибкой при попытке запустить приложение.

Я получаю следующую ошибку:

        10-27 19:17:41.871 26679-26679/com.example.vhuhwavho.friendlychat W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x41bbec08)
    10-27 19:17:41.871 26679-26679/com.example.vhuhwavho.friendlychat E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.vhuhwavho.friendlychat, PID: 26679
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.vhuhwavho.friendlychat/com.example.vhuhwavho.friendlychat.MainActivity}: android.view.InflateException: Binary XML file line #0: Error inflating class Button
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2334)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
    at android.app.ActivityThread.access$900(ActivityThread.java:169)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5487)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
    at dalvik.system.NativeStart.main(Native Method)
    Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class Button
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:719)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:761)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:769)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:498)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
    at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
    at com.example.vhuhwavho.friendlychat.MainActivity.onCreate(MainActivity.java:42)
    at android.app.Activity.performCreate(Activity.java:5451)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392) 
    at android.app.ActivityThread.access$900(ActivityThread.java:169) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:146) 
    at android.app.ActivityThread.main(ActivityThread.java:5487) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
    at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.UnsupportedOperationException: Can't convert to color: type=0x1
    at android.content.res.TypedArray.getColor(TypedArray.java:327)
    at android.support.v7.widget.TintTypedArray.getColor(TintTypedArray.java:163)
    at android.support.v7.widget.ThemeUtils.getThemeAttrColor(ThemeUtils.java:65)
    at android.support.v7.widget.AppCompatDrawableManager.createDefaultButtonColorStateList(AppCompatDrawableManager.java:584)
    at android.support.v7.widget.AppCompatDrawableManager.getTintList(AppCompatDrawableManager.java:536)
    at android.support.v7.widget.AppCompatBackgroundHelper.loadFromAttributes(AppCompatBackgroundHelper.java:53)
    at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:74)
at android.support.v7.widget.AppCompatButton.<init>(AppCompatButton.java:67)
    at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:109)
    at android.support.v7.app.AppCompatDelegateImplV9.createView(AppCompatDelegateImplV9.java:1024)
    at android.support.v7.app.AppCompatDelegateImplV9.onCreateView(AppCompatDelegateImplV9.java:1081)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:690)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:761) 
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:769) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:498) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:398) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:354) 
    at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287) 
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) 
    at com.example.vhuhwavho.friendlychat.MainActivity.onCreate(MainActivity.java:42) 
    at android.app.Activity.performCreate(Activity.java:5451) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392) 
    at android.app.ActivityThread.access$900(ActivityThread.java:169) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:146) 
    at android.app.ActivityThread.main(ActivityThread.java:5487) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:515) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) 
    at dalvik.system.NativeStart.main(Native Method) 
    10-27 19:17:46.696 26679-26679/com.example.vhuhwavho.friendlychat I/Process: Sending signal. PID: 26679 SIG: 9                                                                     

Вот основная деятельность:

package com.example.vhuhwavho.friendlychat;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.InputFilter;
import android.text.TextWatcher;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.ProgressBar;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    public static final String ANONYMOUS = "anonymous";
    public static final int DEFAULT_MSG_LENGTH_LIMIT = 1000;

    private ListView mMessageListView;
    private MessageAdapter mMessageAdapter;
    private ProgressBar mProgressBar;
    private ImageButton mPhotoPickerButton;
    private EditText mMessageEditText;
    private Button mSendButton;

    private String mUsername;


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mUsername = ANONYMOUS;

        // Initialize references to views
        mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
        mMessageListView = (ListView) findViewById(R.id.messageListView);
        mPhotoPickerButton = (ImageButton) findViewById(R.id.photoPickerButton);
        mMessageEditText = (EditText) findViewById(R.id.messageEditText);
        mSendButton = (Button) findViewById(R.id.sendButton);

        // Initialize message ListView and its adapter
        List<FriendlyMessage> friendlyMessages = new ArrayList<>();
        mMessageAdapter = new MessageAdapter(this, R.layout.item_message, friendlyMessages);
        mMessageListView.setAdapter(mMessageAdapter);

        // Initialize progress bar
        mProgressBar.setVisibility(ProgressBar.INVISIBLE);

        // ImagePickerButton shows an image picker to upload a image for a message
        mPhotoPickerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // TODO: Fire an intent to show an image picker
            }
        });

        // Enable Send button when there's text to send
        mMessageEditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                if (charSequence.toString().trim().length() > 0) {
                    mSendButton.setEnabled(true);
                } else {
                    mSendButton.setEnabled(false);
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {
            }
        });
        mMessageEditText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(DEFAULT_MSG_LENGTH_LIMIT)});

        // Send button sends a message and clears the EditText
        mSendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // TODO: Send messages on click

                // Clear input box
                mMessageEditText.setText("");
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return super.onOptionsItemSelected(item);
    }
}

Вотactivity_main.xml в@layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.vhuhwavho.friendlychat.MainActivity">

    <ListView
        android:id="@+id/messageListView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/linearLayout"
        android:stackFromBottom="true"
        android:divider="@android:color/transparent"
        android:transcriptMode="alwaysScroll"
        tools:listitem="@layout/item_message"/>

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:orientation="horizontal">

        <ImageButton
            android:id="@+id/photoPickerButton"
            android:layout_width="36dp"
            android:layout_height="36dp"
            android:background="@android:drawable/ic_menu_gallery" />

        <EditText
            android:id="@+id/messageEditText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_weight="1" />

        <Button
            android:id="@+id/sendButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:enabled="false"
            android:text="@string/send_button_label"/>

    </LinearLayout>

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"/>
</RelativeLayout>

Вотitem_message.xml в@layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:layout_marginLeft="@dimen/activity_horizontal_margin"
              android:layout_marginStart="@dimen/activity_horizontal_margin"
              android:orientation="vertical">

    <ImageView
        android:id="@+id/photoImageView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true" />

    <TextView
        android:id="@+id/messageTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:textAppearance="?android:attr/textAppearanceLarge"
        tools:text="Message" />

    <TextView
        android:id="@+id/nameTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:textAppearance="?android:attr/textAppearanceSmall"
        tools:text="Name" />

</LinearLayout>

Вотbutton_selector.xml в@drawale:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="#999999" android:state_enabled="false"/>
    <item android:color="@color/colorAccent" android:state_enabled="true"/>
</selector>

Вотcolors.xml в@values:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#FF9800</color>
    <color name="colorPrimaryDark">#E65100</color>
    <color name="colorAccent">#2E7D32</color>
    <color name="colorTitle">#ffffff</color>
</resources>

Вотstrings.xml в@values:

<resources>
    <string name="app_name">Friendly Chat</string>
    <string name="sign_out">Sign Out</string>
    <string name="send_button_label">Send</string>
</resources>

Вотstyles.xml в@values:

<resources xmlns:tools="http://schemas.android.com/tools">

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>

        <!--<item name="android:colorButtonNormal">@drawable/button_selector</item>-->
        <item name="colorButtonNormal">@drawable/button_selector</item>
        <item name="android:buttonStyle">@style/FriendlyButtonStyle</item>
    </style>

    <style name="FriendlyButtonStyle" parent="Widget.AppCompat.Button">
        <item name="android:textColor">@color/colorTitle</item>

    </style>
</resources>

Вотmenu.xml в@menu:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/sign_out_menu"
        android:title="@string/sign_out"
        app:showAsAction="never"/>
</menu>

Вотdimens.xml в@values:

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
</resources>

Вот(w820dp) dimens.xml в@values:

<resources>
    <!-- Example customization of dimensions originally defined in res/values/dimens.xml
         (such as screen margins) for screens with more than 820dp of available width. This
         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
    <dimen name="activity_horizontal_margin">64dp</dimen>
</resources>

Пожалуйста, помогите мне решить ошибку.